Dear ffmpeg experts, How to list all supported resolutions of a webcam?
Using the command line tool with the following command: ffmpeg -f dshow -list_options true -i video="HD Pro Webcam C920" I can successfully list all supported video resolutions and formats of the connected Logitech usb webcam. How can I get this list programmatically with help of the C-API? I can successfully open and stream this usb camera using the C-API, but I have to call av_dict_set(&m_pInOptions, "video_size", sVideoSize.c_str(), 0); with a supported video_size before calling ret = avformat_open_inptut(&m_pFormatCtxInCam, szUrl, m_pInFrmt, &m_pInOptions) by checking for ret == -5 I can retry opening the camera with a different video_size. At the moment I loop over a list with several standard video resolutions and try to open The webcam. This is very inconvienient. Also I would like return a list of supported resolutions. Mit freundlichen Grüßen / Best regards Sven Hans DERMALOG Identification Systems GmbH Systems Engineer Mittelweg 120 | 20148 Hamburg | Germany Fon +49 40 413227 0 Fax +49-40-413227-40 Mail [email protected]<mailto:[email protected]> Web www.dermalog.com<https://www.dermalog.com> SECURITY - Made in Germany Biometrics * AFIS * ABIS * Face * Iris * Live Scanners * Border Control * ID Card & Passport Systems * National Identification Solutions * Biometric Banking & Payment Solutions * Mobile Devices DERMALOG - The Biometrics Innovation Leader * Winner of 36 international Awards + Innovator des Jahres 2018 - Innovator of the Year 2018 - brandeins Wissen Statista + CEO 100 - Best 100 CEOs 2018 - Acquisition International + CEO of the year 2018 Biometrics - CEO of the year 2018 - Acquisition International + Deutschlands innovativste Mittelständler 2017 - Wirtschafts Woche -> Find out more about our international Awards here<https://www.dermalog.com/company/awards/> This e-mail may contain information that is confidential or proprietary to DERMALOG Identification Systems GmbH. Any unauthorized disclosure, distribution or other use is prohibited. P Please consider the environment before printing this email ________________________________ DERMALOG Identification Systems GmbH * Mittelweg 120, 20148 Hamburg, Germany CEO/Managing Director: Günther Mull * Commercial Register: AG Hamburg HRB 69547
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